Bob-sled.



A. GUNDERSON.

BOB SLED. APPLICATION FILED FEB. 29, 1908.

Patented Jan. 5, 1909.

wlll AUGUST GUNDERSON, OF MOOSE LAKE, MINNESOTA.

BOB-SLED.

Specification of Letters Patent.

Patented Jan. 5, 1909.

Application filed. February 29, 1908. Serial No. 418,478.

To all whom it may concern:

Be it known that I, AUGUsr GUNDERSON, a citizen of the United States, residing at Moose Lake, in the county of (larlton and State of Minnesota, have invented certain new and useful Improvements in Bob-Sleds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to bobsleds, and has for its object to provide an improved means for detachably connecting the crosstree to the pair of runners, with freedom for a limited rocking motion of the crosstree on the runners; and to this end, my invention consists of the novel devices and combinations of devices hereinafter described and defined in the claim.

The invention is illustrated in the accompanying drawings, wherein like references refer to like parts throughout the several views.

In said drawings; Figure l is a side elevation of a bobsled constructed in accordance with my invention, with some parts removed. Fig. 2 is a cross section, on the line a x of Fig. 1, with some parts broken away, and others shown in elevation. Fig. 3 is a plan view of the castings which connect the crosstree with one of the sled runners, with the crosstree in working position but the sled runner removed; and Fig. 4 is a longitudinal section, on the line a :0 of Fig. 3, with the crosstree removed.

The numeral 1 represents the runners, and the numeral 2 the crosstree of the kind in general use on bobsleds.

The numerals S, 4 and 5 represent parts of a main casting, of which the parts 3 and 4 are adapted to seat the sled runner 1 and permit the same to be rigidly secured thereto by bolts passing through the vertical flanges 4 and the body portion 3 of said casting, and the parts 5 constitute open faced hollow standards rising from the body portion 3, suitably spaced apart from each other.

The numerals 6 and 7 represent a pair of castings constructed in the form of half yokes so that when fitted together, as shown in the drawings, they are adapted to embrace' and seat the end of the crosstree 2 and permit the same to be bolted fast thereto, thus rigidly connecting the yoke and the crosstree together, as best shown in Fig. 3.

The half yokes 6 and 7 are each provided with tenons 8 which are adapted to work between the walls of the open faced guide standards 5. The under or bearing surface of each half yoke casting 6 is made crowning or convex and the portion of the main or base casting on which the same is seated, between the standards 5, is of reversely similar shape, to-wit, made slightly crowning or convex so as to permit an oscillating or rocking motion of the sled runners in respect to the crosstree and its supporting yokes. The faces of the standards 5 flare apart from each other in the vertical plane, or incline upward and outward, while the ends of the yoke castings 6 and 7 are of reversely similar form or incline downward and inward, thereby preserving the guiding action of these parts under the rocking motion of the runners in respect to the crosstree and its supporting yokes. The upper members 7 of the yoke castings are provided with slots 9 through which extend bolts or pins 10 seated in the standards 5, with said parts so related as to permit the crosstree yokes to have the desired rocking motion. Hence, this slot and pin connection between the crosstree yokes and the standards constitute retaining devices which prevent the crosstree and its yokes from being bounced out of its proper working position in respect to the standards 5. The bolster 11 is swiveled to the crosstree 2 by a king pin 12 in the usual way.

The advantages of the above described castings for detachably connecting the runners and the crosstree of a bobsled, with freedom for the necessary oscillating motion of the runners in respect to the crosstree will be readily understood and appreciated by lumbermen and others accustomed to use such sleds for the hauling of logs or other heavy loads over rough roads. By the use of said castings, the wooden crosstree 2 is firmly held while all the jars and strains due to this peculiar service are taken on metallic surfaces a'lforded by the said castings. Moreover, with the use of these castings, it is ex tremely easy to substitute a new crosstree in case of breakage.

By actual usage I have demonstrated the efficiency of the invention herein disclosed and claimed.

What I claim is The combination with a pair of sled runners, and a cross tree, of the separable half yoke castings 6 and 7 adapted to embrace and rigidly hold the ends of the cross tree and i of said main castings and the lower half yoke provided With guide tenons, main castings 6 being reversely crowned to permit oscillatadapted to seat and hold said runners and ing motion, all substantially as described grovided With open faced hollow standards i In testimony whereof I atfix my signature 5 etWeen which the cross tree yokes are i in presence of two Witnesses.

seated With their tenons Working between! AUGUST GUNDERSON the Walls of said standards, and the slot and bolt connections loosely interlocking said Witnesses:

yoke castings to the standards With freedom CLAYTON J. DODGE, 10 for rocking movement, the bearing surfaces JOHN N. EHR. 

